[Eric] It would be somewhat unusual to have an IGP domain in which some nodes
support MPLS and some don't.
[Uma] May be true with non-SR and traditional MPLS.
But with SR I am working with one customer where MPLS (as SR data plane) is
brought into their pure IGP-IP domain.
With static PW labels (inner label) currently pure soft GRE encap is being
used (for transport) but SR is being planned from EPG to cell site routers
eventually.
Planning slow upgrade for some of the MBH nodes with SR-MPLS data plane. In
this case its quite possible to use (in future) non-shortest path SR label
stack.
Interesting. But I'm not sure which of two scenarios you are describing:
1. There is always an MPLS path from ingress to egress, but the shortest
path may not consist entirely of MPLS-capable nodes.
2. There isn't always an MPLS path from ingress to egress. So if the
ingress creates an MPLS packet, some intermediate node may need to
re-encapsulate the packet in IP, in order to get the packet delivered
to the egress node.
Or is the scenario different from either of these two?
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